Green anthracene dye.



UNITED STATES Patented November 22, 1 904.

PATENT OFFICE.

MAX KUGEL, OF WVIESDORF, NEAR COLOGNE, GERMANY, ASSIGNOR TOFARBENFABRIKEN OF ELBERFELD 00., OF NElV YORK, N. Y., A COR- PORATION OFNET/V YORK.

GREEN ANTHRACENE DYE.

SPECIFICATION formingpart of Letters Patent No. 775,367, dated November22, 1904.

Application filed l'uly 21, 1904. Serial No. 217,528. (No specimens.)

To all whom it may concern.-

Be it known that I, MAX KUGEL, doctor of philosophy, chemist, residingat W'iesdorf, near Cologne, Germany, (assignor to the FAR- BENFABRIKENOF ELBERFELD (10., of New York,) have invented a new and usefulImprovement in New Anthracene Dyes; and I hereby declare the followingto be a clear and exact description of my invention.

My invention relates to the manufacture of In carrying out the processpractically I can proceed as follows, the parts being by weight: Amixture of twenty parts of 1-4-diamido-2-3- dibromoanthraquinone, twohundred parts of nitrobenzene, twelve parts of pulverized anhydroussodium acetate, and one-half part of cupric chlorid (CuClg) is heated toboiling for about eight hours while stirring. When the mass has cooleddown to 120 centigrade, the needles precipitated during the reaction arefiltered off and washed with nitrobenzene, alcohol, and hot water.

The new coloring-matter thus obtained represents bluish-black needles,insoluble in alcohol and soluble in concentrated sulfuric acid with agreen color. Upon treatment with hydrosullite and caustic-soda lye it istransformed into a hydro compound, the alkaline l A m/ solution of whichhas the properties of a vat suitable for dyeing and printing. This vatdyes unmordanted cotton blue shades, which turn to fast green onexposing the dyed goods to the air or on washingthem with water.

Having now described my invention and in what manner the same is to beperformed, what I claim as new, and desire to secure by Letters Patent,is

The herein-described new dyestutl' being a hydroazin derivative of theanthracene series, obtainable by heatingll-diamido-2-3-dibromoanthraquinone with cupric chlorid and a suitableliquid, which dyestufi' represents bluish-black needles insoluble inalcohol and soluble in concentrated sulfuric acid with a green color;being transformed into its hydro compound on suitable reduction withhydro- In testimony WhereofIhave signed my name sulfite and caustic-sodalye, the alkaline soluin the presence of two subscribing Witnesses. tionthus obtained exhibiting the typical properties of a Vat which dyesunmordanted cotton blue turning to a fast green shade on Witnesses:

exposing the dyed goods to the air, substan- OTTO KoNIG,

tially as hereinbefore described. HEINR. AHLEFELDER.

MAX KUGEL.

